using DinerContracts.BindingModels;
using DinerContracts.SearchModels;
using DinerContracts.StoragesContracts;
using DinerContracts.ViewModels;
using DinerListImplement.Models;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace DinerListImplement.Implements
{
    public class SnackStorage : ISnackStorage
    {
        private readonly DataListSingleton _source;

        public SnackStorage() { 
            _source = DataListSingleton.GetInstance();
        }

        public SnackViewModel? Delete(SnackBindingModel model)
        {
            for (int i = 0; i < _source.Snacks.Count; ++i) { 
                if (_source.Snacks[i].ID == model.ID) { 
                    var element = _source.Snacks[i];
                    _source.Snacks.RemoveAt(i);
                    return element.GetViewModel;
                }
            }
            return null;
        }

        public SnackViewModel? GetElement(SnackSearchModel model)
        {
            if (string.IsNullOrEmpty(model.ProductName) && !model.ID.HasValue) { 
                return null;
            }
            foreach (var product in _source.Snacks) { 
                if ((!string.IsNullOrEmpty(model.ProductName) &&
                    product.ProductName == model.ProductName) ||
                    (model.ID.HasValue && product.ID == model.ID)) { 
                    return product.GetViewModel;
                }
            }
            return null;
        }

        public List<SnackViewModel> GetFilteredList(SnackSearchModel model)
        {
            var result = new List<SnackViewModel>();
            if (string.IsNullOrEmpty(model.ProductName)) { 
                return result;
            }
            foreach (var product in _source.Snacks) { 
                if (product.ProductName.Contains(model.ProductName)) { 
                    result.Add(product.GetViewModel);
                }
            }
            return result;
        }

        public List<SnackViewModel> GetFullList()
        {
            var result = new List<SnackViewModel>();
            foreach (var product in _source.Snacks) { 
                result.Add(product.GetViewModel);
            }
            return result;
        }

        public SnackViewModel? Insert(SnackBindingModel model)
        {
            model.ID = 1;
            foreach (var product in _source.Snacks) { 
                if (model.ID <= product.ID) {
                    model.ID = product.ID + 1;
                }
            }
            var newProduct = Snack.Create(model);
            if (newProduct == null) return null;
            _source.Snacks.Add(newProduct);
            return newProduct.GetViewModel;
        }

        public SnackViewModel? Update(SnackBindingModel model)
        {
            foreach (var product in _source.Snacks) { 
                if (product.ID == model.ID) {
                    product.Update(model);
                    return product.GetViewModel;
                }
            }
            return null;
        }
    }
}